Dynamical-Decoupling-Based Quantum Sensing: Floquet Spectroscopy
Dynamical-Decoupling-Based Quantum Sensing: Floquet Spectroscopy
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DOI：
10.1103/physrevx.5.041016
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发表时间：
2015-10-30
影响因子：
12.5
通讯作者：
Monteiro, T. S.
中科院分区：
文献类型：
--
作者：
Lang, J. E.;Liu, R. B.;Monteiro, T. S.
最近，通过观察附近电子自旋的相干衰减，传感单个核自旋或核自旋簇的内部动力学成为可能：弱磁噪声被周期性的多脉冲解耦序列放大。然而，除了最简单的情况外，从退相干痕迹中可靠地推断出潜在的原子尺度结构仍然具有挑战性。我们介绍了Floquet光谱作为这些实验分析的通用范式，并认为它提供了一些一般的优势。特别是，这种技术可以推广到更复杂的情况，提供对多体动力学、强耦合和有限持续时间脉冲的物理见解。由于不需要共振驱动，因此提出的光谱方法允许物理解释引人注目但被忽视的相干衰减特征，其形式是潜在的准能量特征谱的避免交叉。通过金刚石中的氮空位中心单自旋传感的情况下，横向场扫描中出现的一组“菱形”特征就是例证。我们还研究了硅供体的应用，表明由此产生的可调相互作用强度为未来的传感器提供了非常有前途的应用。
Sensing the internal dynamics of individual nuclear spins or clusters of nuclear spins has recently become possible by observing the coherence decay of a nearby electronic spin: the weak magnetic noise is amplified by a periodic, multipulse decoupling sequence. However, it remains challenging to robustly infer underlying atomic-scale structure from decoherence traces in all but the simplest cases. We introduce Floquet spectroscopy as a versatile paradigm for analysis of these experiments and argue that it offers a number of general advantages. In particular, this technique generalizes to more complex situations, offering physical insight in regimes of many-body dynamics, strong coupling, and pulses of finite duration. As there is no requirement for resonant driving, the proposed spectroscopic approach permits physical interpretation of striking, but overlooked, coherence decay features in terms of the form of the avoided crossings of the underlying quasienergy eigenspectrum. This is exemplified by a set of "diamond-shaped" features arising for transverse-field scans in the case of single-spin sensing by nitrogen-vacancy centers in diamond. We also investigate applications for donors in silicon, showing that the resulting tunable interaction strengths offer highly promising future sensors.